Abstract：
To replace traditional petrochemical-based thermal insulation materials, in this work, the chitosan (CHI)/alginate (ALG) (CA) aerogels with three-dimensional hierarchical pore network structure were constructed by compositing CHI and ALG using a synergistic strategy of hydrogen bonding dissolution and covalent crosslinking. The structure and properties were further regulated by crosslinking the CA aerogels with epichlorohydrin (ECH). The CA aerogels exhibited various forms of covalent crosslinking, hydrogen bonding and electrostatic interactions, with hydrogen bonding content reaching 79.12 %. The CA aerogels showed an excellent three-dimensional hierarchical pore network structure, with an average pore size minimum of 15.92 nm. The structure regulation of CA aerogels obtained excellent compressive properties, with an increase of stress and strain by 137.61 % and 45.05 %, which can support a heavy object 5000 times its weight. Additionally, CA aerogels demonstrate excellent thermal insulation properties and low thermal conductivity, comparable to commercially available insulation materials. More importantly, CA aerogels have good cyclic insulation stability and thermal properties, and they have a flame retardancy rating of V-0, which shows the stability of insulation properties and excellent safety. CA aerogels provide new ideas for the development of biomass thermal insulation materials and are expected to be candidates for thermal management applications.
摘要：
取代传统的石化基保温材料,在这项工作中，通过使用氢键溶解和共价交联的协同策略将CHI和ALG复合，构建了具有三维分层孔网络结构的壳聚糖（CHI）/藻酸盐（ALG）（CA）气凝胶。通过将CA气凝胶与表氯醇(ECH)交联来进一步调节结构和性质。CA气凝胶表现出各种形式的共价交联，氢键和静电相互作用，氢键含量达到79.12%。CA气凝胶具有良好的三维分层孔网络结构,平均孔径最小值为15.92nm。结构调控的CA气凝胶获得了优异的压缩性能,随着应力和应变分别增加137.61%和45.05%,可以支撑5000倍于其重量的重物。此外,CA气凝胶表现出优异的隔热性能和低热导率，与商业上可用的绝缘材料相当。更重要的是,CA气凝胶具有良好的循环绝缘稳定性和热性能，并且它们具有V-0的阻燃性等级，这表明绝缘性能的稳定性和优异的安全性。CA气凝胶为生物质保温材料的发展提供了新思路，有望成为热管理应用的候选者。
